title: Spin polarization induced by in-plane electric and magnetic fields in two-dimensional heavy-hole systems.
abstract: Using a nonequilibrium Green function approach, we systematically investigate the current induced spin polarization (CISP) in a two-dimensional heavy-hole system with cubic Rashba spin-orbit coupling, driven by in-plane electric and magnetic fields. We find that when a magnetic field is applied along the direction of electric field, the longitudinal conductivity drops monotonously with an increase of magnetic-field strength or of hole density. The spin polarization along the electric-field direction is just the Pauli paramagnetism and it quadratically increases with an increase of hole density. The nonvanishing out-of-plane component of spin polarization emerges for both short-range and long-range disorders, and it changes sign with the variation of magnetic field, especially for long-range hole-impurity scattering. In the magnetic-field dependences of this out-of-plane CISP and of the in-plane CISP perpendicular to the electric field, there are singular magnetic fields, below or above which the effects of magnetic field are completely different.
authors.affiliation: School of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, People's Republic of China. cmwangsjtu@gmail.com
authors.forename: C M
authors.initials: CM
authors.lastname: Wang
authors.forename: S Y
authors.initials: SY
authors.lastname: Liu
authors.forename: Q
authors.initials: Q
authors.lastname: Lin
authors.forename: X L
authors.initials: XL
authors.lastname: Lei
authors.forename: M Q
authors.initials: MQ
authors.lastname: Pang